/* 站点通用样式：零外部依赖，无字体/CDN 请求，便于备案审核与内网部署 */
:root {
  --bg: #ffffff;
  --fg: #17171a;
  --muted: #6b6b76;
  --line: rgba(23, 23, 26, 0.1);
  --brand: #2f6bff;
  --brand-soft: rgba(47, 107, 255, 0.08);
  --soft: #f5f6f8;
  --card: #ffffff;
  --ok: #0f7b4f;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17171a;
    --fg: #ececf1;
    --muted: #9a9aa6;
    --line: rgba(236, 236, 241, 0.14);
    --brand: #4d82ff;
    --brand-soft: rgba(77, 130, 255, 0.12);
    --soft: #202027;
    --card: #1e1e24;
    --ok: #3ecf8e;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.7 "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* 顶栏 */
.nav {
  position: sticky; top: 0; z-index: 10;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
}
.nav .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px; gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; color: var(--fg); font-size: 15px; }
.brand:hover { text-decoration: none; }
.logo {
  width: 26px; height: 26px; border-radius: 8px; flex: none;
  background: linear-gradient(135deg, var(--brand), #7aa2ff);
  display: grid; place-items: center;
  color: #fff; font-size: 12px; font-weight: 700; letter-spacing: -0.5px;
}
.nav-links { display: flex; align-items: center; gap: 22px; font-size: 13px; }
.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--fg); text-decoration: none; }

/* 首屏 */
.hero { padding: 72px 0 56px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 52px; align-items: center; }
.eyebrow {
  display: inline-block; margin-bottom: 16px;
  padding: 4px 10px; border-radius: 999px;
  background: var(--brand-soft); color: var(--brand);
  font-size: 12px; font-weight: 500;
}
.hero h1 {
  margin: 0 0 18px;
  font-size: 40px; line-height: 1.25; letter-spacing: -0.02em; font-weight: 700;
}
.hero p.lead { margin: 0 0 28px; color: var(--muted); font-size: 16px; max-width: 34em; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  height: 42px; padding: 0 20px; border-radius: 10px;
  font-size: 14px; font-weight: 500; border: 1px solid transparent;
  cursor: pointer;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { filter: brightness(1.06); }
.btn-ghost { border-color: var(--line); color: var(--fg); background: transparent; }
.btn-ghost:hover { background: var(--soft); }
.btn-note { font-size: 12px; color: var(--muted); }

/* 首屏示意图：纯 CSS 绘制，不依赖图片资源 */
.mock { display: grid; grid-template-columns: 1fr 26px 1fr; align-items: center; gap: 8px; }
.mock-card {
  border: 1px solid var(--line); border-radius: 12px; background: var(--card);
  overflow: hidden; font-size: 11px;
}
.mock-bar {
  display: flex; align-items: center; gap: 5px;
  height: 26px; padding: 0 10px; border-bottom: 1px solid var(--line); background: var(--soft);
}
.dot { width: 6px; height: 6px; border-radius: 50%; background: var(--line); }
.mock-body { padding: 12px 12px 16px; display: grid; gap: 7px; }
.bar-t { height: 7px; border-radius: 3px; background: var(--line); }
.bar-t.w80 { width: 80%; }
.bar-t.w60 { width: 60%; }
.bar-t.w92 { width: 92%; }
.bar-block { height: 34px; border-radius: 6px; background: var(--brand-soft); }
.mock-label { margin-top: 4px; color: var(--muted); font-size: 10px; }
.mock-arrow { color: var(--muted); text-align: center; font-size: 14px; }
.tree { padding: 12px; display: grid; gap: 6px; }
.tree-row { display: flex; align-items: center; gap: 6px; color: var(--muted); }
.tree-row b { color: var(--fg); font-weight: 500; }
.tree-i { color: var(--brand); font-family: ui-monospace, Consolas, monospace; }

/* 通用段落 */
section.block { padding: 56px 0; border-top: 1px solid var(--line); }
.sec-head { margin-bottom: 30px; max-width: 42em; }
.sec-head h2 { margin: 0 0 10px; font-size: 26px; letter-spacing: -0.01em; }
.sec-head p { margin: 0; color: var(--muted); font-size: 14px; }

/* 功能卡 */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.card {
  padding: 20px 18px; border: 1px solid var(--line); border-radius: 14px;
  background: var(--card);
}
.card .idx {
  display: inline-grid; place-items: center;
  width: 26px; height: 26px; margin-bottom: 14px;
  border-radius: 8px; background: var(--brand-soft); color: var(--brand);
  font-size: 12px; font-weight: 600;
}
.card h3 { margin: 0 0 8px; font-size: 15px; }
.card p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.65; }

/* 流程 */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; counter-reset: step; }
.step { padding: 20px; border: 1px solid var(--line); border-radius: 14px; background: var(--soft); }
.step .n { font-size: 12px; color: var(--brand); font-weight: 600; margin-bottom: 10px; }
.step h3 { margin: 0 0 8px; font-size: 15px; }
.step p { margin: 0; color: var(--muted); font-size: 13px; }

/* 问答 */
.faq { display: grid; gap: 12px; max-width: 780px; }
.qa { padding: 16px 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--card); }
.qa h3 { margin: 0 0 6px; font-size: 14px; }
.qa p { margin: 0; color: var(--muted); font-size: 13px; }

/* 隐私承诺 */
.pledge { display: grid; grid-template-columns: 1.1fr 1fr; gap: 32px; align-items: start; }
.pledge ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.pledge li { display: grid; grid-template-columns: 18px 1fr; gap: 10px; font-size: 13px; color: var(--muted); }
.pledge li::before { content: "✓"; color: var(--ok); font-weight: 700; font-size: 13px; line-height: 1.7; }
.pledge li b { color: var(--fg); font-weight: 600; }

/* 页脚 */
.footer { border-top: 1px solid var(--line); padding: 34px 0 44px; font-size: 12px; color: var(--muted); }
.footer-grid { display: flex; flex-wrap: wrap; gap: 28px; justify-content: space-between; align-items: flex-start; }
.footer-col { display: grid; gap: 8px; }
.footer-col strong { color: var(--fg); font-size: 13px; font-weight: 600; }
.footer-col a { color: var(--muted); }
.beian { margin-top: 26px; padding-top: 18px; border-top: 1px solid var(--line); display: grid; gap: 6px; }
.beian a { color: var(--muted); }

/* 隐私页正文 */
.doc { max-width: 820px; padding: 48px 0 72px; }
.doc h1 { margin: 0 0 8px; font-size: 28px; letter-spacing: -0.01em; }
.doc .meta { margin: 0 0 26px; font-size: 12px; color: var(--muted); }
.doc h2 { margin: 32px 0 10px; font-size: 16px; }
.doc p, .doc li { font-size: 13px; color: var(--fg); }
.doc table { width: 100%; border-collapse: collapse; margin: 10px 0 4px; font-size: 12px; }
.doc th, .doc td { text-align: left; padding: 9px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
.doc th { color: var(--muted); font-weight: 500; }
.doc code {
  font-size: 12px; background: var(--soft); padding: 1px 5px; border-radius: 4px;
  font-family: ui-monospace, Consolas, monospace;
}
.doc .tip {
  margin: 18px 0; padding: 12px 14px; border-radius: 10px;
  background: var(--brand-soft); color: var(--muted); font-size: 12px;
}

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero { padding: 48px 0 40px; }
  .hero h1 { font-size: 30px; }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .pledge { grid-template-columns: 1fr; gap: 24px; }
}

@media (max-width: 640px) {
  .wrap { padding: 0 18px; }
  .nav-links { display: none; }
  .hero h1 { font-size: 26px; }
  .sec-head h2 { font-size: 22px; }
  .cards, .steps { grid-template-columns: 1fr; }
  section.block { padding: 40px 0; }
  .mock { grid-template-columns: 1fr; }
  .mock-arrow { transform: rotate(90deg); }
  .doc { padding: 32px 0 56px; }
  .doc table { font-size: 11px; }
}

/* 落地页与长尾页 */
.page-hero { padding: 54px 0 44px; border-bottom: 1px solid var(--line); }
.page-hero .crumb { margin: 0 0 14px; font-size: 12px; color: var(--muted); }
.page-hero .crumb a { color: var(--muted); }
.page-hero h1 { margin: 0 0 16px; font-size: 34px; line-height: 1.3; letter-spacing: -0.02em; }
.page-hero .lead { margin: 0 0 24px; max-width: 40em; color: var(--muted); font-size: 15px; }

.shot { margin: 0; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; background: var(--soft); }
.shot img { display: block; width: 100%; height: auto; }
.shot figcaption { padding: 10px 14px; font-size: 12px; color: var(--muted); border-top: 1px solid var(--line); }

.prose { max-width: 800px; }
.prose h2 { margin: 34px 0 10px; font-size: 20px; letter-spacing: -0.01em; }
.prose h3 { margin: 22px 0 8px; font-size: 15px; }
.prose p, .prose li { font-size: 14px; color: var(--fg); }
.prose p { margin: 0 0 12px; }
.prose ul, .prose ol { margin: 0 0 14px; padding-left: 22px; }
.prose li { margin: 4px 0; }
.prose code {
  font-size: 12px; background: var(--soft); padding: 1px 5px; border-radius: 4px;
  font-family: ui-monospace, Consolas, monospace;
}
.prose table { width: 100%; border-collapse: collapse; margin: 12px 0 18px; font-size: 13px; }
.prose th, .prose td { text-align: left; padding: 10px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose th { color: var(--muted); font-weight: 500; }
.prose .note { margin: 18px 0; padding: 12px 14px; border-radius: 10px; background: var(--brand-soft); color: var(--muted); font-size: 13px; }

.cta-band {
  margin: 36px 0 0; padding: 26px 24px; border: 1px solid var(--line); border-radius: 16px;
  background: var(--soft); display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px;
}
.cta-band h2 { margin: 0 0 6px; font-size: 18px; }
.cta-band p { margin: 0; color: var(--muted); font-size: 13px; }
.cta-band .actions { gap: 10px; }

.btn.is-pending { opacity: 0.55; cursor: default; }
.btn.is-pending:hover { filter: none; background: var(--soft); }
.store-note { margin: 10px 0 0; font-size: 12px; color: var(--muted); }

.related { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.related .card h3 { font-size: 15px; }

@media (max-width: 900px) {
  .page-hero h1 { font-size: 28px; }
  .related { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .page-hero { padding: 40px 0 32px; }
  .page-hero h1 { font-size: 24px; }
  .cta-band { padding: 20px 18px; }
}